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參數(shù)資料
| 型號： | EVAL-AD7664CBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 4/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR AD7664 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | PulSAR® |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 570k |
| 數(shù)據(jù)接口： | 串行，并聯(lián) |
| 輸入范圍： | ±VREF |
| 在以下條件下的電源（標(biāo)準(zhǔn)）： | 115mW @ 500kSPS |
| 工作溫度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7664 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | AD7664ACPZ-ND - IC ADC 16BIT UNIPOLAR 48-LFCSP AD7664ASTZRL-ND - IC ADC 16BIT UNIPOLAR 48LQFP AD7664ASTZ-ND - IC ADC 16BIT UNIPOLAR 48-LQFP |
REV. E
–12–
AD7664
The Normal Mode is the fastest mode (500 kSPS) without any
limitation on the time between conversions. This mode makes the
AD7664 ideal for asynchronous applications such as data
acquisition systems, where both high accuracy and fast sample
rate are required.
The Impulse Mode, the lowest power dissipation mode, allows
power saving between conversions. When operating at 100 SPS,
for example, it typically consumes only 21
W. This feature
makes the AD7664 ideal for battery-powered applications.
Transfer Functions
Using the OB/
2C digital input, the AD7664 offers two output
codings: straight binary and twos complement. The LSB size is
VREF/65536, which is about 38.15
V. The ideal transfer charac-
teristics for the AD7664 are shown in Figure 4 and Table II.
000...000
000...001
000...010
111...101
111...110
111...111
ADC
CODE
–
Straight
Binary
ANALOG INPUT
VREF – 1.5 LSB
VREF – 1 LSB
1 LSB
0V
0.5 LSB
1 LSB = VREF/65536
Figure 4. ADC Ideal Transfer Function
Table II. Output Codes and Ideal Input Voltages
Digital Output Code
Hexa
Analog
Straight
Twos
Description
Input
Binary
Complement
FSR – 1 LSB
2.499962 V
FFFF
1
7FFF
1
FSR – 2 LSB
2.499923 V
FFFE
7FFE
Midscale + 1 LSB
1.250038 V
8001
0001
Midscale
1.25 V
8000
0000
Midscale – 1 LSB
1.249962 V
7FFF
FFFF
–FSR + 1 LSB
38
V0001
8001
–FSR
0 V
0000
2
8000
2
NOTES
1This is also the code for overrange analog input (V
IN – VINGND above
VREF – VREFGND).
2This is also the code for underrange analog input (V
IN below VINGND).
TYPICAL CONNECTION DIAGRAM
Figure 5 shows a typical connection diagram for the AD7664.
100nF
10 F
100nF
10 F
AVDD
10 F
100nF
AGND
DGND
DVDD
OVDD
OGND
WARP
IMPULSE
SER/
PAR
CNVST
BUSY
SDOUT
SCLK
RD
CS
RESET
PD
IN
INGND
REFGND
1 F
CREF1
2.5V REF1
REF
100
D3
CLOCK
AD7664
ANALOG INPUT
(0V TO 2.5V)
C/ P/DSP
SERIAL
PORT
DIGITAL SUPPLY
(3.3V OR 5V)
ANALOG
SUPPLY
(5V)
DVDD
CC
OB/
2C
4.7nF
U12
15
NOTES
1THE ADR421 IS RECOMMENDED WITH C
REF = 47 F.
2THE AD8021 IS RECOMMENDED WITH A COMPENSATION CAPACITOR C
C = 10 pF, TYPE CERAMIC NPO.
3OPTIONAL LOW JITTER CNVST.
Figure 5. Typical Connection Diagram
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